Abstract
Reservoirs are important water sources of urban drinking water supply. Bacteria play an important role in the removal of organics in reservoirs, but part of them can pose heath risk to consumers. Knowledge of bacterial community composition in drinking water sources can favour the drinking water security safeguards. This study investigated the composition and diversity of bacterial communities in the three cascade reservoirs by high-throughput Illumina HiSeq sequencing in a whole hydrological year monthly. The diversity and structure of bacterial community showed distinct spatiotemporal variation. Mycobacterium, Acinetobacter, Sphingomonas, Sphingobacterium and Pseudomonas were the genera resistant to chlorine. In addition, Acinetobacter, Arcobacter, Mycobacterium, Pseudomonas and Staphylococcus were the main potential pathogenic genera. The bacterial community diversity and the average relative abundance of potential pathogenic genera detected in wet season were higher than those in dry season. Besides, water temperature was found the main factor for the temporal variation. The spatial variation of bacterial community diversity and the average relative abundance of potential pathogenic genera were found related to water current and the degree of water pollution, respectively. The results of this study can conduce to the beneficial management of the drinking water treatment processes.
Bacterial communities in cascade reservoirs along a large river
